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   1  /**
   2   * Accordion-folding functionality.
   3   *
   4   * Markup with the appropriate classes will be automatically hidden,
   5   * with one section opening at a time when its title is clicked.
   6   * Use the following markup structure for accordion behavior:
   7   *
   8   * <div class="accordion-container">
   9   *    <div class="accordion-section open">
  10   *        <h3 class="accordion-section-title"><button type="button" aria-expanded="true" aria-controls="target-1"></button></h3>
  11   *        <div class="accordion-section-content" id="target">
  12   *        </div>
  13   *    </div>
  14   *    <div class="accordion-section">
  15   *        <h3 class="accordion-section-title"><button type="button" aria-expanded="false" aria-controls="target-2"></button></h3>
  16   *        <div class="accordion-section-content" id="target-2">
  17   *        </div>
  18   *    </div>
  19   *    <div class="accordion-section">
  20   *        <h3 class="accordion-section-title"><button type="button" aria-expanded="false" aria-controls="target-3"></button></h3>
  21   *        <div class="accordion-section-content" id="target-3">
  22   *        </div>
  23   *    </div>
  24   * </div>
  25   *
  26   * Note that any appropriate tags may be used, as long as the above classes are present.
  27   *
  28   * @since 3.6.0
  29   * @output wp-admin/js/accordion.js
  30   */
  31  
  32  ( function( $ ){
  33  
  34      $( function () {
  35  
  36          // Expand/Collapse accordion sections on click.
  37          $( '.accordion-container' ).on( 'click', '.accordion-section-title button', function() {
  38              accordionSwitch( $( this ) );
  39          });
  40  
  41      });
  42  
  43      /**
  44       * Close the current accordion section and open a new one.
  45       *
  46       * @param {Object} el Title element of the accordion section to toggle.
  47       * @since 3.6.0
  48       */
  49  	function accordionSwitch ( el ) {
  50          var section = el.closest( '.accordion-section' ),
  51              container = section.closest( '.accordion-container' ),
  52              siblings = container.find( '.open' ),
  53              siblingsToggleControl = siblings.find( '[aria-expanded]' ).first(),
  54              content = section.find( '.accordion-section-content' );
  55  
  56          // This section has no content and cannot be expanded.
  57          if ( section.hasClass( 'cannot-expand' ) ) {
  58              return;
  59          }
  60  
  61          // Add a class to the container to let us know something is happening inside.
  62          // This helps in cases such as hiding a scrollbar while animations are executing.
  63          container.addClass( 'opening' );
  64  
  65          if ( section.hasClass( 'open' ) ) {
  66              section.toggleClass( 'open' );
  67              content.toggle( true ).slideToggle( 150 );
  68          } else {
  69              siblingsToggleControl.attr( 'aria-expanded', 'false' );
  70              siblings.removeClass( 'open' );
  71              siblings.find( '.accordion-section-content' ).show().slideUp( 150 );
  72              content.toggle( false ).slideToggle( 150 );
  73              section.toggleClass( 'open' );
  74          }
  75  
  76          // We have to wait for the animations to finish.
  77          setTimeout(function(){
  78              container.removeClass( 'opening' );
  79          }, 150);
  80  
  81          // If there's an element with an aria-expanded attribute, assume it's a toggle control and toggle the aria-expanded value.
  82          if ( el ) {
  83              el.attr( 'aria-expanded', String( el.attr( 'aria-expanded' ) === 'false' ) );
  84          }
  85      }
  86  
  87  })(jQuery);